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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76b3bb78aeb27927e04a7718837add8f73d965b391cab33bc4e43eef94f0926' 
  AND token = 'LFEj9AA1+YpXcN5ciHpzPn2hq4m7Y+8pMgFTPGSJyX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}